Hi Phillip, I've run into this myself outside of boost compilation.
The issue stems from the default options for the new MS-compile not supporting synchronous writes to PDB files.
I believe this issue only arises during the compilation stage, in Visual studio I pass it the /FS option it desires.
I believe you might be able to use CXXFLAGS to pass the FS command to the compiler.
Eg:
b2 -j2 release cxxflags=/FS
That said, I haven't tested this method myself (yet). (if this occurs during the linking stage you may need to pass linkflags=/FS also)
If I may ask, are you attempting to compile the static libraries? using multi-compilation to accelerate the process? If so you may wish to consider using --with-LIBNAME for just the libraries in question.
eg:
b2 --with-aiso --with-thread --with-filesystem
This will make the process much faster if you do not need the entire collection.
Yours,
John